Use the same popover creation code in more places, which adds Escape and
Command-. to dismiss popovers.
Ensure that popovers both get and can accept first responder, preventing
keyboard input from leaking through to an underlying view controller.
Without this, it can be confusing as, for example, you can navigate to a
different story while you’ve got a ‘mark read’ popover shown for another
story.
Added a new “Ask” item to the Long Press Story Title preferences.
Chosen by default.
When “Ask” is selected, the feed detail long press displays a menu with
mark read options and other long press options.
Only the older/newer long-press one; still have the story image one,
but I think that’s okay as-is since it has a title/alt text display.
Also removed some redundant code.
